Download UBCD

If you have arrived here from an external link, Ultimate Boot CD allows you to run floppy-based diagnostic tools from CDROM drives and consolidate as many diagnostic tools as possible into one bootable CD. An experimental feature also allows you to run UBCD from your USB memory stick on newer machines that supports booting from USB devices. Read more about UBCD and the full list of freeware diagnostic tools included here.

*as702 has contributed an updated version of dosubcd.img for UBCD V4.1.1, including instructions. This is the same version of dosubcd.img that is included in the beta version of UBCD V5.0.

Please note that I do not host the downloads directly due to the sheer amount of bandwidth required and its associated cost. Instead I rely on a network of mirror sites offered and maintained by volunteers. If you find a particular mirror site to be down temporarily, please be patient and try another one.

Few, if any, of the mirror sites offer the ISO image directly due to the inefficiency of sending an uncompressed image. They will typically host the ZIP and/or self-extracting EXE archive, which is much smaller than the original ISO image after compression. Where possible, please download the self-extracting EXE archive because it is a good deal smaller than the ZIP archive, which means you can download it a little faster, and the mirror site will use less of its bandwidth resource.

After you have downloaded either the ZIP or self-extracting EXE archive, extract it to your harddisk. You should get a single file called ubcdnn.iso, where nn is the version number eg. ubcd40.iso. Some users have reported seeing a whole bunch of folders and files after performing the extraction. This is wrong, and is likely the result of your decompression utility trying to be too smart. Some decompression utility, on seeing the ISO file in the archive, will attempt to extract the content of the ISO file! Try tweaking with the options of your decompression utility, or use another decompression utility. I would recommend using 7-Zip, which is an open-source freeware that is capable of extracting both ZIP and 7-Zip archives, in addition to many other types of archive files.

If you have problems extracting the archive, try comparing your download with the file size or checksum above. If you don't already have tools to calculate the MD5 or SHA-1 checksum, I recommend eXpress CheckSum Calculator, though there are tons of other checksum calculators or verifiers around that you can easily locate with a simple Internet search.

After you have successfully extracted the single ISO file, you now need to burn it to CD. This is another topic that frequently trips up newbies who are not familiar with their CD recording software, such as Nero or Easy CD Creator. Some of you end up burning the ISO file itself to the CD, or some other weird results. The easiest way to burn the ISO file to CD is to use a small specialized freeware such as BurnCDCC or Active@ ISO Burner. Where possible, experiment with CDRW discs instead of CDR discs so that you can start over if something goes wrong, instead of churning out coasters.

If you wish to try the experimental option of running UBCD from a USB memory stick, you will need to either burn the ISO file to a CD first, or extract the files within the ISO file to your hard disk using a suitable utility. Then, use tools\ubcd2usb\ubcd2usb.bat to write UBCD to your USB memory stick. Note that ubcd2usb.bat will format and erase your entire USB memory stick. Due to its experimental nature, some or all of the UBCD apps may not work even if your machine supports booting from a USB memory stick.

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